Here is a good picture of a Greylag. They look a lot like domestic geese, German greys etc. I have seen domestic geese with Canada geese. I won't say it is not possible but since Greylags are not north American birds but come from across the Atlantic the odds are you saw a domestic goose.
http://www.arkive.org/greylag-goose/anser-anser/
Last edited by Oldtimr; 04-29-2016 at 06:54 AM.